// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/public/browser/font_list_async.h"

#include <utility>

#include "base/bind.h"
#include "base/values.h"
#include "content/common/font_list.h"
#include "content/public/browser/browser_thread.h"

namespace content {

namespace {

    // Just executes the given callback with the parameter.
    void ReturnFontListToOriginalThread(
        const base::Callback<void(std::unique_ptr<base::ListValue>)>& callback,
        std::unique_ptr<base::ListValue> result)
    {
        callback.Run(std::move(result));
    }

    void GetFontListInBlockingPool(
        BrowserThread::ID calling_thread_id,
        const base::Callback<void(std::unique_ptr<base::ListValue>)>& callback)
    {
        std::unique_ptr<base::ListValue> result(GetFontList_SlowBlocking());
        BrowserThread::PostTask(calling_thread_id, FROM_HERE,
            base::Bind(&ReturnFontListToOriginalThread, callback,
                base::Passed(&result)));
    }

} // namespace

void GetFontListAsync(
    const base::Callback<void(std::unique_ptr<base::ListValue>)>& callback)
{
    BrowserThread::ID id;
    bool well_known_thread = BrowserThread::GetCurrentThreadIdentifier(&id);
    DCHECK(well_known_thread)
        << "Can only call GetFontList from a well-known thread.";

    BrowserThread::PostBlockingPoolSequencedTask(
        kFontListSequenceToken,
        FROM_HERE,
        base::Bind(&GetFontListInBlockingPool, id, callback));
}

} // namespace content
